Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 73: Surface Dynamics: Reactions and Elementary Processes
O 73.13: Poster
Mittwoch, 9. März 2016, 18:15–20:30, Poster A
Pt single atoms and nanoclusters stabilized by ultrathin oxide film: performance and oxygen vacancy creation in CO oxidation — •xiong zhou1,2, kai wu1, and wei chen2 — 1BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China — 2Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
A series of model catalysts consisting of Pt single atoms and nanoclusters supported by monolayered CuO film grown at Cu(110) were successfully prepared, which could be stabilized well above room temperature and exhibited a high performance in CO oxidation at temperatures as low as ~360 K. Combined scanning tunneling microscopy and temperature-programmed desorption measurements directly evidenced that at the initial CO oxidation stage, oxygen vacancy in the CuO lattice was generated at the nearest neighbour of the Pt nanoclusters. The experimental measurements showed that the oxidation activity was inversely proportional to the Pt nanocluster size. In contrast, the Pt single atoms possessed no surface reactivity for the CO oxidation due to the early and complete desorption of CO before its oxidation on the model catalysts commenced.